Perhaps you should try some spelling variations:
nganh tuong » nganh cong, manh tuong, nganh nong
tuong hoc » truong hoc, tuong ho, duong hoc
sach doi » sach hoi, sach moi, sach dao
toan hoc » toan khoa, van hoc, hoa hoc
khoi van » khoi can, khoi va, thoai van
ban tuan » van tuan, ban quan, ban than
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
mon hoc » dong hoc
ra khoi » xa khoi, trao khoi, cac khoi
hoc ra » hoc ma, hoc ha, hoc ca

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach doi tap, nghien cuu ((mon hoc) or (toan hoc)) nganh tuong hoc ra khoi van ban tuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu ((mon hoc) OR (toan hoc)) nganh tuong hoc ra khoi van ban tuan.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu ((mon hoc) or (toan hoc)) nganh tuong hoc ra khoi van ban tuan*.